Yamazaki Sena is a serious "high school student" and the patron saint of Kemi. So her life is destined to be extraordinary.
When the Kemis were taken away, she and another patron saint had no choice but to follow them. After getting the drive, Yamazaki Sena focused on finding the user of the drive. Sneaking into the school disguised as a transfer student, he met Ichinose, the transformer of Kamen Rider Gothard, and Rinne Kudo, a student of the Alchemy Academy.
Concept: The adventure story of the Guardian God of Kemi and the Kamen Riders guarding Kemi together.